Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd621e0c5ad314dc8579f23367c0a6cb52b692c4ff9d4738fca9841cc97b837b8' 
  AND token = 'sSLNeen81IrDu5WUqdFdZcQ9erEz3c45BKNJ1+SCFvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}